Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc52e9ad675e9e17…

MALICIOUS

PDF

86.1 KB Created: 2021-03-25 02:09:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 29a1566cf364d2240a6a03b91de98839 SHA-1: b85f5edc8c886cd5ee8d3962fcf98bb3ede65ec8 SHA-256: dc52e9ad675e9e17c51e586412495479e7c58beb6fbb2062f3d6a46f0a2b2e22
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jottigo.ru/award?keyword=pdf+file+editor+apk+free+download PDF link annotation
    • https://rebodegumirimak.weebly.com/uploads/1/3/0/7/130775130/3813569.pdfIn PDF document text
    • https://zisojuvamifofe.weebly.com/uploads/1/3/1/3/131383842/zudamajoma.pdfIn PDF document text
    • https://modagifamu.weebly.com/uploads/1/3/5/3/135341464/sozesamazi_vevulozofoworej_pixalol_tojaze.pdfIn PDF document text
    • http://tosemuzariku.iblogger.org/mekomejotizapopezuxapo.pdfIn PDF document text
    • http://zatomemogi.iblogger.org/king_of_my_heart_bethel_music_-_acoustic_instrumental_piano_karaoke_with_lyrics.pdfIn PDF document text
    • https://kuzapulekoxiror.weebly.com/uploads/1/3/2/6/132681507/b552c4ae7fe166.pdfIn PDF document text
    • https://tagenomamoz.weebly.com/uploads/1/3/4/4/134476715/7304821.pdfIn PDF document text
    • http://sowurokirifi.22web.org/welabadu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suwisekuxowiw.epizy.com/ca_125_elevado_causas.pdfIn PDF document text
    • http://lakutinegodoted.epizy.com/20800540410.pdfIn PDF document text
    • http://muxolisakij.epizy.com/timiwik.pdfIn PDF document text
    • http://ferumovixugixu.epizy.com/xezokemilipaviw.pdfIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_ab1fcaea1940425a98a05c92eba51216.pdf?index=trueIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_35e0b25ca52f483d8f3fe5175840e70b.pdf?index=trueIn PDF document text
    • http://xofiketur.rf.gd/coroners_reports_online_nz.pdfIn PDF document text
    • http://rupeguv.epizy.com/bt_plc_annual_report_2018.pdfIn PDF document text
    • http://sidumudopok.rf.gd/words_their_way_suffixes_and_affixes.pdfIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_061330d250f54bdf8756b3eebcd34bb0.pdf?index=trueIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_230e8e208857420e960e8d0e0fcff7d6.pdf?index=trueIn PDF document text
    • https://b3df6b87-ca8d-4c26-b815-8c697753997b.filesusr.com/ugd/896a32_fc8069d364f14b66bdd6a9bea12cdff2.pdf?index=trueIn PDF document text
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_465dfa1beae640b0a6547070edc8ace8.pdf?index=trueIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_97e941a27e184b299dbcf4cee517d35d.pdf?index=trueIn PDF document text
    • https://5db246a0-94da-4013-9f64-c970003367b9.filesusr.com/ugd/ca5179_8219ddf81d90407db0c3e84a3583d73f.pdf?index=trueIn PDF document text
    • http://pitefabe.epizy.com/57157116433.pdfIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_e9658108ccc64f87aed01e9df7d52fb9.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001147d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147D 5016 bytes
SHA-256: 4ad215abab754109c418d20672da3f35bea758199678b0fc56750b9c99840520
font_01_sfnt_off000125b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B1 10856 bytes
SHA-256: 29840a2d20675766e7b0773b15c4c10e6afb590761ac3b48428466160294badd

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